An iron rod of susceptibility 599 is subjected to a magnetising field of 1200 A $m^{-1}$. The permeability of the material of the rod is :
$(\mu_o = 4\pi \times 10^{-7} T\,m\,A^{-1})$
- $2.4 \pi \times 10^{-4} T\,m\,A^{-1}$
- $8.0 \pi \times 10^{-5} T\,m\,A^{-1}$
- $2.4 \pi \times 10^{-5} T\,m\,A^{-1}$
- $2.4 \pi \times 10^{-7} T\,m\,A^{-1}$
The Correct Option is A
Solution and Explanation
Also, $\mu_{r}=1+\chi_{m}=600$
We know, $\mu=\mu_{r}\mu_{o}$
$\mu=600\times4\pi\times10^{-7}$
$\mu=2400\pi\times10^{-7}$
$\mu=2.4\pi\times10^{-4}\,T\,m\,A^{-1}$
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Concepts Used:
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Magnets are used in many devices like electric bells, telephones, radio, loudspeakers, motors, fans, screwdrivers, lifting heavy iron loads, super-fast trains, especially in foreign countries, refrigerators, etc.
Magnetite is the world’s first magnet. This is also called a natural magnet. Though magnets occur naturally, we can also impart magnetic properties to a substance. It would be an artificial magnet in that case.
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